JPS5918010A - Heater for vehicle equipped with water-cooled engine - Google Patents

Abstract

PURPOSE:To realize efficient use of a heat exchanger by forming said exchanger in one body with an intake air passage and performing intake air heating in a room heater which lets cooling water circulate through the heat exchanger, heating the water by means of exhaust gas, and a heater core. CONSTITUTION:During warming up operation, the function of a control circuit device 24 is such that selector valves 12, 14 are put on the heat exchanger 10 side and the heater core 5 side respectively according to signals from a blower switch 7, water temperature sensor 27, and cooling water is heated by means of an engine E through driving a pump 22 and further heated by means of exhaust gas in an exhaust gas paassage 9, while room heating being performed by means of a heater core 5. Further, in case air intake heating is not performed during room heating, a valve 29 is closed, while in case it is performed, the valve 29 is opened with an opening according to a signal from a water temperature sensor 31, and intake air is heated up to the predetermined temperature by means of an air intake passage part 28a united in one body with the heat exchanger 10. On the other hand, in case of air intake heating when the room heater is in OFF state, the selector valve 14 is put on the bypass 13a side to let cooling water flow, and opening of the selector valve 12 is adjusted according to a signal from the water temperature sensor 31, while in take air being heated with the temperature of cooling water of the heat exchanger 10.

Description

[Detailed description of the invention] The present invention relates to a heating device for a vehicle equipped with a water-cooled engine.

BACKGROUND ART In vehicles, especially automobiles, heating the interior of the vehicle is essential to improve comfort during winter operation. Currently, as this heating device, if the car is equipped with a water-cooled engine, a hot water type device that uses the heat of engine cooling water is used.

However, in conventional hot water heating systems, the temperature of the cooling water does not rise sufficiently, especially when the engine is cold, and therefore the heating does not work satisfactorily.

Therefore, in Utility Model Application No. 55-13360g, the cooling water that has been heated to some extent by the engine (cylinder) is further heated using the heat of the exhaust gas, and this further heated cooling water is used for heating. A heating device for an automobile has been proposed.

The heating device described in this published utility model publication further heats the cooling water heated by the ennon (cylinder) with exhaust gas, and uses this further heated cooling water for heating, so there is sufficient heat. Although a heating temperature can be obtained, in order to further heat the cooling water with exhaust gas in this way, it is necessary to provide a device such as a heat exchanger in the cooling water circulation passage. However, devices such as heat exchangers have, of course, been used only when operating the heating device, and have not been used efficiently.

SUMMARY OF THE INVENTION In view of the drawbacks of the above-mentioned conventional heating devices, it is an object of the present invention to provide a heating device for a vehicle equipped with a hydrostatic engine that can also be used as an intake air heating means.

The present invention takes cooling water out of the cooling water mantle of the engine body, installs it in the exhaust passage, and exchanges heat with the exhaust gas.
A heating system for a vehicle equipped with a water-cooled engine, which is equipped with a heater cooling water circulation path that returns the cooling water to the cooling water sleeve through a heat exchanger that heats the cooling water and a heater core for heating the vehicle interior. %R means that the heat exchanger is formed integrally with the intake passage and that the intake air is heated by the heat exchanger.

The heating system for a vehicle equipped with a water-cooled ennon according to the present invention has the following structure: a heat exchanger for heating cooling water with exhaust gas is integrated with the intake passage (-1) the heat exchanger heats the intake air; Therefore, the heat exchanger described above can be used efficiently.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A heating device for a vehicle equipped with a water-cooled engine according to the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a schematic diagram of a heating system for a vehicle equipped with a water-cooled engine according to a first embodiment of the present invention.

In FIG. 1, reference numeral E indicates a water-cooled engine mounted on an automobile (not shown) 1-5.A cooling water canopy 1 is provided outside the combustion chamber of this Ennon E. This cooling water cannula 1 is divided into upper and lower parts by a partition wall P, and constitutes a cylinder head part water cannula 1a and a cylinder head part water cannula 1b. The cylinder head water cannula 1a is a high temperature part, and the cylinder block water cannula 1b is a low temperature part.

A cooling water inlet 2 and an outlet 3 are formed in the cylinder head water cannula 1a. The inlet 2 and the outlet 3 are communicated by a heating cooling water circulation path 4, and a heater core 5, which is a heat exchanger for heating the vehicle interior, is interposed in the circulation path 4. This heater core 5F
i. The air sent by the block 6 is heated by heat exchange with the heated cooling water passing through the heater core 5. This heated air is introduced into the vehicle interior for heating purposes. The blower 6 may be turned off, for example.
It is operated by a manual heater switch or blower switch 7 having ranges of , LOW, and Hl.

In the figure, reference numeral 8 indicates an exhaust manifold, and an exhaust passage 9 is connected to the exhaust manifold 8. A heat exchanger 10 is provided in the middle of the exhaust passage 9 between the outlet 3 of the circulation route 4 and the heater core 5, and the cooling water sent to the heater core 5 through the circulation route 4 is transferred to this heat exchanger 10. It is heated in the heat exchanger 10 by exhaust gas. A bypass passage 11 is formed in the exhaust passage 9 to bypass a portion where a heat exchanger 10 is provided. The temperature of the cooling water flowing into the circulation path 4 from the outlet 3 is sufficiently high in the bypass passage 11, and the cooling water is transferred to the heat exchanger 10.
This is a place where exhaust gas can flow when there is no need to heat it. In this case, a switching valve 12 is provided at the branching part of the pi-to-slope passage 11 from the exhaust passage 9 to adjust the exhaust gas between the exhaust passage 9 where the heat exchanger 10 is provided and the bypass passage 11. It is designed to flow.

In the circulation path 4, only the heater core 5 is connected. A bypass passage 13a and a first bypass passage 13b that connects both the heater core 5 and the heat exchanger 10 are provided. These pinos passages 1
Switching valves 14, 15 are provided at the branch points between 3a and 13b and the circulation passage 4, respectively. A lanoator 16 that cools the cooling water flowing through the bypass passage is arranged in the first pi/ps passage 13b.

On the other hand, a cooling water inlet 17 and an outlet 18 are also formed in the cylinder block water jacket 1b.

The inflow port 17 and the outflow port 18 are communicated by a cooling water circulation path 20 for the lanoator, and this circulation path 2
0 is provided with a lassoator 21. The heating circulation path 4 and the lanoator circulation path 20 are independent from each other. Therefore, circulation route 4
The first water, I? 7'22 is connected to the circulation path 20.
A third water pump 23 is separately provided in each of the two. The first water pump 22 is driven and controlled by a control circuit 24 consisting of a microcomputer.
On the other hand, the Y-th water pump 23 is driven by the engine E.

The circulation path 20 is provided with a pi-27 passage 25 through which the lanoator 21 is passed. The piston passage 25 is used to help warm up the engine by circulating the cooling water without passing through the lanoator 21 when the engine is cold. For this reason, a thermostatic valve 26 is provided at the branching portion of the circulation passage 20 and the bypass passage 25 to allow cooling water to flow into the bypass passage 25 until the engine is sufficiently warmed up.

The heat exchanger 10 is formed integrally with a part of the intake passage 28 downstream of the carburetor (hereinafter, this part is referred to as a riser part), and the mixture is sent to Ennon E through the riser part 28. The air is heated by the heat exchanger 10. This riser portion 28 is divided into a seventh passage portion 28a through which the mixture flows so as to touch the heat exchanger 10, and a λ-th passage portion 28b through which the mixture flows without touching the heat exchanger 10. ing. A flow control valve 29 for adjusting the amount of air-fuel mixture to the first passage portion 28a is disposed between the first and second passage portions 28a, 2'8b.

The cylinder head water cannula 1a and the heat exchanger 10 are provided with first and second water temperature sensors 30, 31, respectively. The output ends of these water temperature sensors 30, 31 are connected to the control circuit 24. A blower switch 7 is connected to the other input terminal of this control circuit 24.
The control circuit 24 receives a heating device ON/OFF signal S1 from the blower switch 7, and a signal S indicating the cooling water temperature from the water temperature sensor 30.31,
- control valves 12.14.29;

Next, the operation of the heating device having the structure described above will be explained.

First, the operation of the heating system when the engine E is in a cold operating state will be explained. The blower switch 7 of the heating device is moved from the OFF state to the ON state, LOW or Hl range, and a signal S1 indicating this and the water temperature sensor 27 are generated.
When the signal S2 from
1, and the switching valve 14 is placed in the position where pipe 1 is closed.
3a, and the switching valve 15 is set to the position where the pipe/gas passage 13b is closed. On the other hand, since the temperature of the cooling water is low, the thermostatic valve 26 is opened so that the cooling water flows into the 84797 passage 25.

The control circuit 24 also receives a signal S from the blower switch 7.
driving the first water pump 22 by I;
Cooling water is circulated through the circulation path 4 in the order of the heat exchanger 10 and the heater core 5. The cooling water circulated in the circulation path 4 is heated by the cylinder head of the engine E in the cylinder head water cannula 1a. The cooling water heated by the cylinder head flows into the circulation path 4 from the outflow [] 3, and is further heated by the exhaust gas flowing through the m-air oil path 9 in the heat exchanger 10. This further heated cooling water is sent to the heater core 5.

The heater core 5 heats the air sent from the blower 6 and sends it into the vehicle interior to heat the vehicle interior. The cooling water that has passed through the heater core 5 is returned to the seven-ring head water cannula 1a from the inlet 2 by the water pump 22. In this way, the cooling water is sufficiently heated by the relatively high-temperature cylinder head and the heat exchanger 10, so that a sufficient heating temperature can be obtained even when the engine E is at a low temperature.

The first water pump 23 is still driven by the Ennon E to circulate the cooling water through the circulation path 20, but as mentioned above, when the Ennon F is cold, the thermostatic valve 26 causes the cooling water to flow into the bypass passage 25. Since the cooling water is not set to flow through the lassoator 21 and therefore does not dissipate heat, the
Promote warming up.

When the water temperature sensor 27 detects that the temperature of the cooling water in the cylinder head water jacket 1a has reached a predetermined temperature or higher as the warming up of the Ennon E progresses, the control circuit 24 controls the switching valve 12.
Open the heat exchanger 1 in the exhaust passage 9 and
Set to close the 0 side. Thus, heat exchanger 10
Stop heating the cooling water by exhaust gas to prevent overheating of the cooling water and ennon.

On the other hand, as described above, when the engine E warms up and the temperature of the cooling water circulating in the circulation path 20 reaches a predetermined temperature or higher, the thermostat valve 26 gradually opens so that the cooling water also flows to the lassoator 21, thus The cooling water is cooled in the lanoator 21, and the cooling water and Ennon E's 7
Prevents overheating of the ring block.

In the above heating device, the first water pump 22 basically rotates at a constant speed when the heating device is ON, and when the heating device is OFF, the cooling water in the cylinder head water cannula 1a is detected by the water temperature sensor 30. The rotation may be controlled in proportion to the temperature (according to the signal S2).

Next, the control of intake air heating by the control circuit 24 will be explained. When the heating device is ON and intake air heating is not performed, the valve 29 is closed and the intake air is supplied to the riser part 28.
When heating the intake air without flowing into the seventh passage portion 28a, the valve 29 is opened at an opening degree according to the temperature of the cooling water detected by the water temperature sensor 31 (according to the signals S, K). It is opened and heated so that the intake air temperature reaches a predetermined constant temperature. On the other hand, when the heating system is turned off,
When not performing intake air heating, switch/Z) rev 15.
When setting the position to allow cooling water to flow through the pi/pass passage 13b and heating the intake air, set the switching valve 14 so that the cooling water flows through the pi/Q passage 13a, and set the water temperature sensor. The position of the switching valve 12 is adjusted according to the temperature of the cooling water detected by the heat exchanger 10 to adjust the amount of exhaust gas flowing into the passage 9 and 11.
The heating temperature of the cooling water is adjusted, thus controlling the intake air temperature to a predetermined constant temperature.

In the above embodiment, the partition wall that divides the cooling water cannula 1 into the 7-ring head section and the cylinder block section is of a complete partition type, but as shown in Fig. 2, the 7-ring head section of the cooling water cannula An incomplete partition wall P' may be provided to allow some cooling water to flow between the cylinder and the cylinder block. In the above embodiment, the heating cooling water circulation path 4 and the lanoator cooling water circulation path 20 are completely independent, but as shown in FIG. It can also be used as a. In this case, as shown in the figure, the outlet 18
It is necessary to provide a thermostatic valve 40 at the outflow port 1B, which opens when the cooling water reaches a predetermined temperature or higher, and a thermostatic valve 41 at the branch of the passages 4 and 20. , the lanoator 16 shown in FIG. 1 is no longer necessary, and the water pump W can be used instead, resulting in a non-pull structure. Furthermore, Water 71? It is of type 0, driven by a power source of 7°W and a power source of E.

Furthermore, in the second embodiment, the cooling water cannula 1 was divided into the seven-ring head section 1a and the cylinder block section 1b to form a high temperature section and a low temperature section. Middle cylinder water mantle 1 by walls P, , P2
A and the outer cylinder water jacket 1b may be separated to form a high temperature section and a low temperature section.

Also, in the above embodiment, the flow control valve 2
9 to control the degree of heating of the intake air. Instead of this valve 29, a heat insulating material is prepared, and this heat insulating material is placed on the riser part 28 at a position where it completely covers the heat exchanger 10 and there. It is also possible to control intake air heating by placing the cooling water outside the heat exchanger, which performs both the heating of the intake air and heating the cooling water. In addition to providing a heat exchanger that performs only heating, the exhaust gas is adjusted to flow between the λ heat exchangers, thereby controlling intake air heating.
You can also do 1.

[Brief explanation of the drawing]

7 is a schematic diagram of a heating device according to a first embodiment of the present invention, FIG. 2 is a schematic diagram of a heating device according to a second embodiment of the present invention, and FIG. 3 is a schematic diagram of a heating device according to a second embodiment of the present invention. FIG. 3 is a plan view showing a modification of the cooling water canister used in the heating device. E...Engine 1...Cooling water mantle 1a...Cylinder head water mantle 1b.../Ring block water mantle 4...Heating cooling water circulation passage 5...Heater core 9...Exhaust passage 10...・Heat exchanger 20... Cooling water circulation passage for lanoator 22... First water pump 23... Second flood water pump 28... Riser partial patent applicant Toyo Kogyo Co., Ltd.

Claims (1)

[Claims] Cooling water is taken out from the cooling water mantle of the engine body, and the cooling water is cooled by passing through a heat exchanger that is installed in the exhaust passage and heats the cooling water through heat exchange with exhaust gas, and a heater core for heating the vehicle interior. In a heating system for a car equipped with a water-cooled ennon, which is equipped with a heater cooling water circulation path that returns to the water cannula, the water-cooled ennon is configured such that the heat exchanger is integrally formed with the intake passage, and the heat exchanger heats the intake air. Vehicle heating system.